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Terahertz radiation by self-focused amplitude-modulated Gaussian laser beam in magnetized ripple density plasma

Published online by Cambridge University Press:  21 October 2015

Ram Kishor Singh  and
R. P. Sharma
Ram Kishor Singh*
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi-110016, India
R. P. Sharma
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi-110016, India
*
Address correspondence and reprint requests to: Ram Kishor Singh, Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi-110016, India. E-mail: [email protected]
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Abstract

This paper presents a theoretical model for efficient terahertz (THz) radiation by self-focused amplitude-modulated laser beam in preformed ripple density plasma. The density of plasma is modified due to ponderomotive nonlinearity which arises because of the nonuniform spatial profile of the laser beam in magnetized plasma and leads to the self-focusing of the laser beam. The rate of self-focusing depends on the intensity of the amplitude-modulated beam as well as on the externally applied magnetic field strength. The electron also experiences time-dependent ponderomotive force by the laser beam at modulated frequency. A nonlinear current at THz frequency arises on account of the coupling between the ripple density plasma and nonlinear oscillatory velocity of the electrons. The yield of the generated THz radiation enhances with enhancement in self-focusing of the laser beam and applied magnetic field.

Keywords

Amplitude-modulated Gaussian laser beamMagnetized plasmaPonderomotive nonlinearitySelf-focusingTerahertz radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 4 , December 2015 , pp. 741 - 747
Copyright
Copyright © Cambridge University Press 2015 

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